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Renewable Energy: unregistered pv

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  1.  
    • CommentAuthortychwarel
    • CommentTimeApr 8th 2023
     
    I have a 3kw Pv system installed approx 2 years ago.
    I have just found out that the G98 registration was not done and the installer is no longer trading.
    I have found the partially filled in forms, however since the installation WPD our local network provider have become part of National Grid.
    I cannot find how to do a G98 registration on their new website.
    Any advice on how to proceed would be appreciated.
    •  
      CommentAuthordjh
    • CommentTimeApr 8th 2023
     
    First hit in google is https://www.nationalgrid.co.uk/g98-applications and if you don't understand then apparently 0800 096 3080 is the number to call. Maybe https://connections.nationalgrid.co.uk/g98-connection-procedures is relevant as well (second hit)
    • CommentAuthorphiledge
    • CommentTimeApr 8th 2023
     
    When we applied last year to add a second PV system our DNO had no record of our existing system installed in 2015, but they weren't really that bothered that the record was missing. I beleive theres a national concession to install up 3.68kw so I wouldn't be unduly worried that the notification hasnt been made yet.

    If you can't find where to send the notification, just send it recorded delivery to their head office not forgetting to include a single line drawing of the house electrics showing where the PV is connected.
    • CommentAuthortychwarel
    • CommentTimeApr 8th 2023
     
    Philedge. I am not unduly worried, however I am looking to add a battery unit to it soon and would like it to be above board for that.
    • CommentAuthorphiledge
    • CommentTimeApr 8th 2023
     
    We did a G99 for the additional PV which is when the absence of the 2015 notification came to light. The G99 superseded the 2015 paperwork that should have been in place so the G99 covered both existing and new.

    If youre adding batteries just put in the G99 (fastrack?) application as that will cover existing PV and the new batteries
    • CommentAuthorrevor
    • CommentTimeApr 8th 2023
     
    Were you MCS registered and are you getting paid for export. (SEG) If you are not I would not concern yourself too much. Not sure the DNO is that bothered about the battery all they are concerned about is the amount you are capable of feeding into the grid. And with 3kw I guess they won't be bothered. If you are going to the trouble of doing the application is it worthwhile you extending the number of panels to make it worthwhile your investment in the battery?
    • CommentAuthorphiledge
    • CommentTimeApr 8th 2023
     
    MCS and the DNO are not linked. The DNO isn't bothered whether the install is MCS or not, they're interested that the kit you connect to the grid meets their standard's and what the max you can export is. If the battery you add is AC coupled and capable of exporting, its the max possible combined export capacity the DNO wants to know about. If the OPs new battery can export 3.6kw and the PV inverter can do 3kw thats an export total of 6.6kw and theyd definitely want to know about that.
    • CommentAuthorrevor
    • CommentTimeApr 10th 2023
     
    Posted By: philedgeMCS and the DNO are not linked. The DNO isn't bothered whether the install is MCS or not, they're interested that the kit you connect to the grid meets their standard's and what the max you can export is. If the battery you add is AC coupled and capable of exporting, its the max possible combined export capacity the DNO wants to know about. If the OPs new battery can export 3.6kw and the PV inverter can do 3kw thats an export total of 6.6kw and theyd definitely want to know about that.


    What controls the export is the inverter. What ASFAIU the DNO is interested in is the Manufacturers declaration of conformity according to recommendation G100 "Technical Requirement for customer export limiting schemes". This is the case for all inverters capable of exporting more than 3.6 kw and maybe for those smaller. That conformity details how the limit is controlled. Some are controlled by a clamp on the meter incoming tails others as with my inverter via a systems meter which measures the export and is controlled by the inverter software accessible via an installer password. As an example my inverter is 6kw and have 6kw of panels. The export limit was set by the software and 3.64 Kw until May last year when my limit allowed was raised to 5kw and simply done via the software. If tychwarel is going to fit a battery then he will need some new inverter arrangement and it is that which will control his export regardless of the source of the generation. In my opinion if a battery is to be fitted I would do the whole job and submit a new DNO application rather than try and put right what was not done properly 1st time.
    • CommentAuthorphiledge
    • CommentTimeApr 10th 2023
     
    Posted By: revor

    What controls the export is the inverter.


    That's correct if batteries are DC coupled and connected to the existing PV inverter. If the batteries are AC coupled, then its the batteries inverter that limits the batteries export, which is in addition to the existing PV. As mentioned previously that could easily take him way over the 16amp(3.68kw) G98 limit.

    G100 is used where the DNO wants you to limit the output of an inverter to less than its type tested output. If you seek permission for a 6kw inverter to operate at 6kw then G100 doesnt come into play. The DNO is interested in the inverters rating on the type test declaration
    • CommentAuthortychwarel
    • CommentTimeApr 10th 2023
     
    Dear all.
    Thanks for the advice. I will probably talk to the battery installers and get them to sort it.
    • CommentAuthorphiledge
    • CommentTimeApr 12th 2023 edited
     
    Posted By: tychwarelI will probably talk to the battery installers and get them to sort it.

    Given that you and I have both had suppliers seemingly not do the paperwork correctly, you might want to take on the paper work yourself. If they're DC coupled batteries theres a fair chance you just need to submit a G98 notification. If they are AC coupled then likely a G99 application is needed. Battery installer should be able to tell you what they are proposing.

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